Try this: long press the tiktok app > app info > battery > restricted (restrict battery use while app is running in the background). See if that helps out with battery life. Do the same for snapchat.
Seriously, you can try restricting the background data and modifying which notifications you are alerted about. Also you can make it a "sleeping application."
Some apps are just battery hogs. As users we have to own our choices. If we want to use certain apps and features, we just have to accept that they come with increased battery drain or resource hogging. There are a few things you can do to try to minimize it, like the the things others have suggested here. However, if you use these apps, you just have to accept that they use more battery than some others. Just my 2 cents
